Heat Interface Unit (HIU) Service & Repair, Birmingham

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HIU service £95, £115 or £170 depending on the package. Emergency HIU repair £225 including up to 3 hours. Parts are quoted first.

No travel charge within 10 miles of B20 2JS. Further out, £2 per mile may apply — always agreed before anything is booked. Full price list

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What do you need?Choose a service…Boiler repair or breakdownEmergency (no heat, no hot water, leak)New boiler or replacementBoiler serviceLandlord gas safety certificate (CP12)Gas leak detection or trace (no smell now)Power flush / cold radiatorsRadiators, valves and TRVsPlumbing repairGas fire service or repairGas cooker or hob fittingSmart heating controlsHot water cylinder or immersion heaterLPG heatingHeat interface unit (HIU) service or repairAir source heat pump service or repairElectric boiler, water heater or thermal storeSomething else / not sure

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Boiler make (optional)Not sure / not relevantWorcester BoschVaillantBaxiIdealGlow-wormPottertonMainViessmannIntergasATAGVokeraBiasiFerroliAristonOther

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What a HIU actually is

A Heat Interface Unit sits in your flat and does the same job as a combi boiler — it gives you heating and hot water on demand — but instead of burning gas itself, it draws hot water from a shared pipe network that runs through the whole building or development. That shared supply is called a heat network, and the building's own energy centre does the actual heat generation. If your flat has never had a gas meter and the heating "boiler" on the wall has no flue, it is almost certainly a HIU rather than a combi.

Why an annual service matters

The logic is identical to a gas boiler, even though there is no gas involved. A neglected HIU develops the same pattern of faults: strainers clog, valves stick, pressure sensors drift, and heat exchangers lose efficiency. Most manufacturers require documented annual servicing to keep the warranty valid, and a service is far cheaper than the breakdown it prevents. If you are a leaseholder, your lease may also require it; if you manage a block, it is very likely a condition of your building's heat network agreement.

Our three service packages

Essential — £95

The core checks every HIU needs: visual inspection, strainer clean, pressure top-up, venting, temperature checks at the outlets, and a written report. Right for a HIU under warranty that has never given trouble.

Complete — £115

Everything in Essential, plus a secondary strainer clean, valve servicing, an inhibitor and expansion vessel check, minor leak repairs, and performance fine-tuning. Our standard recommendation for most flats.

Premium — £170

Everything in Complete, plus heat exchanger cleaning, full fault diagnosis, and a thorough controls check. Right for an older HIU, one that has never been properly stripped down, or one showing early signs of reduced performance.

Emergency repair — £225

If your HIU has stopped delivering heating or hot water, £225 covers a callout and up to three hours of labour to find and fix the fault. That covers the large majority of HIU repairs in one visit. Anything needing a replacement part, or a repair running past three hours, is quoted separately before we continue — you are never billed blind.

Signs your HIU needs attention

• Heating or hot water inconsistent, or running hot and cold
• Low or fluctuating pressure at the taps or shower
• Banging, gurgling or whistling from the unit
• Any leak, rust or visible corrosion around the casing
• Having to reset the unit regularly to get it working again
• An unexplained rise in your heating and hot water charges
• Error codes or warning lights on the display
• It has not been serviced in the last twelve months

Recent HIU work

A Meibes HIU in a Newtown apartment block with no hot water and leaks, after five other engineers had been out to try to diagnose it. The PM valve on the hot water side had a joint patched with sealant and a hose clip; we replaced the valve and had the customer back up and running. Read the case study, with photos.

An emergency repair on an Intatec Hiper HIU, booked online by a landlord in London: the tenant had no hot water, we were at the flat within two hours, freed a sticking PICV and stripped the manifold to clean out a seized strainer packed with dirt. Hot water back the same afternoon, and a new PICV booked for a return visit. Read the case study, with photos.

A Complete service on a Caleffi HIU in a Jewellery Quarter loft apartment. The unit was fine; the water was not: dark brown and with no inhibitor in the system. The customer was shown the sample, agreed, and the circuit was dosed on the same visit, with a five-star Google review that afternoon. Read the case study, with photos.

A Hiper HIU in the Jewellery Quarter with no hot water: the Pressure Independent Control Valve had failed. We fitted a new PICV, confirmed the heating side was unaffected, and left the unit fully operational with the tenant back in hot water.

A Meibes HIU near Snow Hill, Birmingham city centre, same symptom — no hot water. The three-way PM valve had failed; we ordered the correct replacement, swapped it and tested the unit through both modes before signing it off.

A city-centre HIU with heating but no hot water: the flow switch on the domestic hot water line had failed, so the unit never got the signal to heat. We ordered the like-for-like switch, returned to fit it and tested the unit. See the photos and the write-up.

Manufacturers we work on

We service and repair HIUs from the manufacturers most commonly found in Birmingham new-builds and conversions, including Altecnic, Heatlink, Intatec and other mainstream brands. If you are not sure what make you have, a photo of the unit and its data label is usually enough for us to identify it before we arrive.

Landlords and managing agents

If you manage a block or a portfolio of flats on a heat network, we can service HIUs across multiple units on a single visit and issue a report for each one — useful for meeting your obligations under heat network regulations and keeping tenants comfortable through winter. Ask about rates for group bookings.

Prices

Listed prices are the price for the job as described. Parts are quoted before we fit them, and HIU installations are priced in writing after a free survey. No travel charge within 10 miles of B20 2JS; further out, £2 per mile may apply, agreed before booking. How our prices work.